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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Coelorachis thailandica

HABIT Perennial; caespitose. Culms erect; slender; 26 cm long. Culm-internodes distally pubescent, or pilose. Culm-nodes pubescent. Leaf-sheaths loose; 2.5–6 cm long; pubescent. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blades 5–20 cm long; 4–8 mm wide. Leaf-blade surface pubescent; hairy on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes; terminal; embraced at base by subtending leaf.

Racemes 1; single; smoothly terete; 6 cm long. Rhachis fragile at the nodes; semiterete; pubescent on surface. Rhachis internodes cuneate; 2–2.5 mm long. Rhachis internode tip transverse; crateriform; with simple rim.

Spikelets sunken; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels oblong; semiterete; 3 mm long; pubescent.

STERILE SPIKELETS Companion sterile spikelets rudimentary; comprising 2 unequal glumes without lemmas; ovate; 1 mm long; shorter than fertile; deciduous with the fertile.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 4 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus glabrous; base truncate; with central peg; attached transversely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume ovate; asymmetrical; 1 length of spikelet; coriaceous; 2-keeled; winged on keel; winged narrowly; winged above. Lower glume surface smooth; pubescent. Lower glume apex acute. Upper glume ovate; 3 mm long; membranous; 1-keeled; keeled above. Upper glume primary vein ciliate. Upper glume surface with a dorsal tuft of hair.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret oblong; hyaline. Fertile lemma elliptic; hyaline; without keel; 0 -veined.

FLOWER Anthers 3; 1 mm long; yellow. Stigmas 2.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Andropogoneae. Traiperm et al 2011.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.